Welding machine is a device that moves along the specified track according to the selected welding speed or flux delivers the welding head and torch to the position to be welded.
Welding machine is generally composed of pillars, beams, rotary mechanism, trolley, etc. Each component is a building block structure. Generally, pillars and beams are its basic components. The other components can be selected according to different user requirements. The columns and beams are welded by bending and have good rigidity. Light, medium and heavy welding operators are all equipped with triangular guideways, while super heavy ones are equipped with flat square guideways, which are grinded and quenched by high frequency. The high precision and wear resistance of the guide rail are fully guaranteed. It is applied to longitudinal and circumferential seam welding of inner and outer seams of cylindrical workpieces in pressure vessels such as boiler drums and petrochemical vessels.
1. Welding fixture should move quickly and operate conveniently, and the position of operation should be in the easy accessible and suitable position for workers. Especially for manual fixture, the height of operation should be set at the position where the worker can exert the most force. Its operation force should not be too large and its operation frequency should not be too high. When the fixture is in the clamping state, it should be self-locking.
2. Welding fixture should have enough welding space, which can not affect welder observation and welding operation, and can not hinder the loading and unloading of welding parts. All positioning elements and clamping mechanisms shall be at an appropriate distance from the weld bead, or arranged below or on the side of the weldment. The actuator of the clamping mechanism shall be able to be retractable or transposed.
3. Reliable clamping and appropriate rigidity. The clamping does not destroy the location and geometric shape of the weldment. After clamping, it does not make the weldment loose and slip, nor does it make the restraint of the weldment excessively large, resulting in greater stress. When clamping, the surface quality of weldments should not be damaged. When clamping thin and insulating weldments, clamping force should be limited, or some measures should be taken, such as the travel limit of the pressing head, increasing the contact and accumulation of the pressing head, adding copper and aluminium liner, etc.
4. In order to ensure the safety of use, necessary safety interlock protection devices should be set up.
5. For fixtures close to the welding position, the heat insulation of the handle should be considered and the damage of welding spatter to the clamping mechanism and the surface of the locator should be prevented. The application point of fixture should be located at the support of weldment or near the support.
6. Attention should be paid to the special requirements of various welding methods on fixture in the aspects of heat conduction, electric conduction, magnetic insulation and insulation. For example, in flash welding and convex welding, the fixture acts as both conductive body; in brazing, the fixture acts as both heat sink, so the fixture itself is required to have good thermal conductivity and conductivity. For example, the fixture used in vacuum electron beam welding can not be made of magnetic material and the fixture can not have remanence in order not to affect the focusing of electron beam.
7. Fixtures for large plate welded structures should have sufficient stiffness and strength, especially the stiffness of the fixture body, which has a great impact on the shape and size accuracy of the structure, so large redundancy should be left in the design. The structure of locator and clamping mechanism should not be too many on the same fixture, and only one power source should be selected as far as possible. The fixture itself should also have better manufacturing technology and higher mechanical efficiency.
8. Choose as much as possible the universal and standardized clamping mechanism and standard parts to make welding fixture.